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C. S. CONE.

PAPER FASTENING.

APPLICATION FILED 05c. 11. 1911.

1,324,144. I Patented Dec. 9,1919.

- Inn/em w WRmM-S M 'width of the stem 14: of the tongue.

tinrrnn s raa as earner orrr CHARLES S. CONE, OF LA CRQSf-SE, WISCONSIN, ASSIGNOR TO SPENGLER-LQQMIS MANU- FACTURING CGMPANY, A CGEG11ATION OF ILLINOIS.

PAPER-FASTENING.

Application filed December 11, 1917.

To all whom it may concern:

Be it known that I, CnAnLss S. CONE, a citizen of the United States, residing at La Crosse, in the county of La Crosse and State of Wisconsin, have invented certain new and useful ,lniprrwements in Paper- Fastenings, of which the following is a specification.

My invention relates to paper fastening and has for its object to provide a novel and ethcient paper-lock and method of fornnng the same, for the securing of sheets of paper together by the interlocking of parts of the paper plies.

In the drawings wherein I have illustrated an embodiment of my invention, Fig ure 1 illustrates superimposed paper sheets cut to provide the members for interlock ng the sheets; Fi 2 is a. similar view showing the lock completed; Fig. 3 is plan View showing the interlocking process of formation; Fig. 4: is a perspective from the underside of the structure shown in the figure, illustrating the completed lock; Fig. 5 is a detail showin a. step of loo-Information; and Fig. 6 is a sectional view showing a further step in the process of lock-formation as effected by a suitable machine.

In the drawing A and A. represent two paper sheets, typical of a suitable piurality to be joined. Through both of such sheets the cuts requisite for the provision of the tongue and slit formation of the lock features are made in precise registry, preferably by superimposing the paper sheets and efiecting the cutting operations and manipulation of the tongue by machine, so insuring perfect uniformity of the operations on all sheets afiected.

The sheets are out along a line 10 of suitable configuration to sever the sides and end of a tongue 12 that has a broadened tip or head 13 and a narrower body or stem 14:, the root or base of which is unsevered and in tegral with the paper. In rear of the tongue root, in longitudinal alinenient with the tongue, and at a distance back of the tongue root not greater than the length of the tongue-stem portion 14 I provide a Y shaped slit 16, the arms 17 of the Y diverging toward the tongue root at a wide angle, said arms being relatively short and only of sufiicient length to embrace within their tips a width equal to or slightly greater than lghe Specification of Letters Patent.

Patented Dec. 9, 1919.

Serial No. 206,591.

slit-arms17 meet, at their juncture, a central longitudinal slit 18 of materially greater length than the axial dimension of the head 13 of the tongue. Thus when the tongue is folded back upon its root its stem will underlie the uncut bridge 20 of paper and its V-shaped tab 21, intervening between the tongue root and the ends of the slit arms 17, the slit arms will span across the tonguestem relatively close to the head of the tongue, and the head of the tongue will underlie a short portion only of the slit 18, and the contiguous angular slit-borders 22.

In the formation of the paper lock the tongue out from the several paper sheets is bent rearwardlyas described under the paper bridge 20, and then the portion of said tongue extending beyond said bridge is tucked through the Y-shaped slit 16, the head of the tongue being folded somewhat along an axial line for passage through the slit 16 without tearing the paper, either 01: the tongue or of the slit borders 22. hen the headed end of the tongue has been thus forced through the slit, a portion of its stein lies within the embrace of the slit arms 1.? with the if-shaped" tab 21 from the paper bridge 20 overlying the tongue. The head of the tongue is then flattened out to spread over a surface of the paper wider than the spread of the slit arms 17 and to overlie a short portion of the slit-stein 18.

Such a paper lock is highly etiicacious for securing the paper sheets against separation. In practice it is so secure against pulling of the sheets apart that the interlocked parts never accidentally separate, but will tear rather than become unlocked. It will be observed that not only is the broad head of the tongue passed through an opening narrower than the head, for positive locking eifect, but the paper of the tongue is gripped in the narrow confines of the Y-arins of the slit, and the shape of the slit is such that contact with the tongue with the edges of the slit-arms 1?, is on an angular line for especially efficacious frictional gripping efiect.

The construction of the paper slit 16 with its stem 18 materially exceeding the axial dimension of the tongue portion which is to be passed through it, gives to the pertions of the paper bordering laterally on the slit 16 a flexibility that enables them readily to bend out of the way without tearing the paper when the tongue head is be ing inserted through the slit by means of a narrow tucking instrument on which the tongue head may told as shown in Fig. 5, and yet does not weaken the look.

In practice I employ in making such looks a machine as described in my co-pending application filed December 11, 191?, Serial No. 206,592, the construction of which is sufliciently suggested in Fig. 6 hereof for purposes of pr sent disclosure. In said figure, 30 represents a paper receiving base, suitably apertured at 31 and overlaid by an apertured stripper plate 32 between which and the base the paper sheets A are passed to be cut. Toward this base there works acutter jaw carrying a cutter 34; suitably shaped to form the tongue 13, a narrow lcnit'e blade or slitter 35 suitably shaped to form the Y-slit 16, and, when depressed, to leave a free space 30 above its cutting blade. 3'? repr, .nts a tucker element, pivoted in the tongue cutter 31 arranged for oscillation by contact of a cam portion thereoi. with a portion of the stripper plate 39. In the descent of the cutter jaw, a narrow curred finger part out said tucker rises,

05 while the cutters are in engagement with the paper passing over blade 85 to tuck the cut tongue through the slit 16 in the Fashion hereto tore described. (in retraction of the upper j aw the tucker is retracted by spring 38 and the cutters emerge above the paper, whereupon withdrawal of the paper from under the stripper spring 32 flattens down the tongue head 13 and the tab 21.

it will be understood that I do not intend to limit my present invention to construe-- tions eii'eetuated by machinery of the construction illust-ratively shown, as such locks may be formed by independently operated hand tools or noncoijrdinated devices, as well as by coordinated mechanisms specifically diii'erent from that shown in Fig. 5; and it will further be understood that changes in design and proportions of the locked parts might be made without a departure from the spirit of my invention within the scope of the appended claims.

What I claim is:

1. The method of forming a paper-lock between a plurality of paper-sheets which consists in cutting in the paper -sheets, jointly, a tongue having a narrower stem and a broader head; cutting through the paper-sheets jointly, beyond the tongue-root and without removal of material, a slit having connected transverse arms jointly extending laterally to substantially the same width as the width of the tongue-stem adjacent to the head and having also a longitudinal limb intercepting the arms, said limb being of materially greater length than the axial length of the tongue-head; and tucking the tongue-head through said slit to engage the portion of the tongue stein close to the head in the transverse arms of the slit, for frictional and positive locking of the tongue.

2. The method o'l ibrining a paper lock which consists in cutting from the paper a headed tongue, slitting in rear of the tongue root a (shaped slit having its stem materially longer than its Y-arms and its arms of extent to embrace between them a width substantially that of the tongue stem, and passing said tongue head in partly folded condition through said Y-slitto engage a portion of the tongue stem, close to the tongue head, in the if-shaped slit portion provided by said arms.

A paper lock formed in paper sheets for holding them in engagement comprising a headed tongue out from the sheets jointly, and a it-shaped slit in rear of the tongue-root, the spread of the arms of said slit, from tip to tip, substantially equaling the width of the tongue-root, and the length of the stem oi said slit materially exceeding the axial depth of the head. of the tongue, the headed end of said tongue being passed through the slit with the tongue stem embraced by the Y-arnis of the slit, and a portion of the tongue head over-laid by the ii-shaped tab of paper between said arms.

curta ns s. cons. 

